package main

import (
	"fmt"
	"os"
)

func main() {
	if len(os.Args) == 1 {
		panic("not enough args")
	}
	operate := os.Args[1]
	switch operate {
		case "add":
			fmt.Println("adding")
		case "delete":
			fmt.Println("deleting")
		case "modify":
			fmt.Println("modifying")
		case "query":
			fmt.Println("quering")
			fallthrough
		default:
			fmt.Println("operate error")
	}
}